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## Homework Statement

In the picture below, is a circuit of constant direct current. The receiver is made of a changable resistor with resistance R. If the reciever delivers maximum electrical power its resistance is

a)9 b)6 c)3 d)1.5 e)0.5

## Homework Equations

Im having trouble finding the equation for this

## The Attempt at a Solution

I cant find the theory of this curcuit, the equations that fit so can you guide me a little in any way that could help?